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The Frozen star wrote a lengthy essay about the importance of equal rights for women and mused why the differences between men and women were seen to be negative.

She shared: "There are many people in this great world who think women are not equal to men. And, I realize this may be a flammable opinion, but I would have to agree. My singular view through the looking glass has led me to believe that we are not the same. Should we have equal power? Yes. Should we earn equal wages? Yes. Should our voices be heard at equal volume? Hell yes.

"But does X=Y, or in this case, x chromosome = y chromosome? I have to say no. There are differences? -?inherent and unwavering differences. For the majority of the human timeline, these differences were openly viewed as female weaknesses; creating a chasm between men and women. And though that view has been quieted, it has not disappeared. There are echoes of it everywhere you look. My question is who decided these differences were weak?"

The 35-year-old actress - who has two daughters, Lincoln, three, and 17-month-old Delta with her husband Dax Shepard - hopes to "flip the narrative" so women aren't criticised for being different to men.

Writing for The White House as part of the United State of Women section, she added: "I'd like to add my voice to so many who have chosen to flip the narrative and see these disparities as beautiful, unconquerable and inspiring.

"I don't like to paint any picture with a wide brush, mainly because I'm a terrible artist and a wide brush makes it difficult to stay in the lines. Yes, obviously the painting in said metaphor is a paint-by-number. But whether it's nature, nurture, labels, or all of the above, there are certain traits that are traditionally associated with being a female. We are often called sensitive, emotional and non-confrontational. Hey ladies, guess what? These all go into the 'pro' column."